Not easy to figure out and all contain proprietary ingredients.
Saw this at one site:
http://www.fuel-testers.com/review_gas_treatment_products.html
Presence of ethanol complicates the product as it adds a separation
problem. Otherwise I would expect antioxidants and metal sequestering
agents to be the main ingredients.

The good news:
If e10 gasoline is stored in an ***totally air-tight*** can it will stay fresh for at least a year.
The bad news:
Those crappy plastic gas cans they sell at Walfart are prolly not air-tight.
I've had good luck with this brand:
www.amazon.com/Eagle-U2-51-S-Galvanized-Capacity-Diameter/dp/B000BQO15I

Looks like a very functional nozzle.
I am using these things: http://tinyurl.com/klru389
with this nozzle: http://tinyurl.com/ldw97dn
$28 + $45 = $73... about the same price. My nozzle is "OK", but your
nozzle looks superior.
A better nozzle for mine (that I was unaware of when I ordered my cans)
looks to be: http://www.dasmule.com/metal-nato-jerry-can-nozzle /, but
now the price is twelve bucks more...
The good part, though, is that with mine the nozzle is not bundled. I
can have five cans at $45 each and one more nozzle that looks as
functional as yours at $40...
OTOH, I would also give yours more points for ergonomics when pouring.
Not a lot of points, but some....

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